Shear tooth clipper blade



April 30, 1940. H. B. woMAcK SHEAR TOOTH CLIPPER BLADE Filed June 30,1939 Patented Apr. 30, 194D UNITED STATES SHEAR 'roo'rn CLIPPER BLADEHenry B. Womack,Birmingham, Ala. 7 Application June 30, 1939, Serial No.282,234

This invention relates to clippers and has for one of its objects theproduction of a toothed formation for the guard as well as the cuttingblade of clippers and the like, specially designed 5 to produce ashearing action for facilitating the cutting of hair, wool and the like,whether the tool is used by barbers, orfor shearing animals.

A further object of this invention is the; production of a simple andefficient toothed arrangement for clippers, wherein each tooth of theguard is provided with one straight and one inclined side cutting edgeand each tooth of the cutting blade is provided with similar cuttingedges in a manner whereby the inclined cutting edges of the cuttingblade teeth, by moving across the straight edges of the guard teeth andvice versa, will produce an eflicient shearing action.

Other objects and advantages of the present invention will appearthroughout the following specification and claims.

In the drawing: 1,

Figure 1 is a perspective View of the head of a clipper, showing theimproved cutting teeth;

Figure 2 is a top plan view of the base of the clipper and cutting bladecarried thereby, the upper portion of the clipper being removed;

Figure 3 is a plan view of the guard;

Figure 4 is a plan view of the cutting blade;

Figure 5 is an enlarged fragmentary top plan view of the blade andguard, showing the relative arrangement of the guard teeth and cuttingblade teeth.

By referring to the drawing, it will be seen that A designates theconventional type of clipper. 35

vide a specially devised type of guard teeth H] which extend forwardlyof the clipper. Each tooth I is provided with a straight cutting edge Hwhich extends at approximately right angles to the longitudinal axis ofthe row of teeth, and each tooth I0 is also provided with an inclinedcutting edge l2, which inclined cutting edge l2 extends at an angle ofapproximately thirty degrees to the longitudinal axis of the row ofteeth. A conventional cutting blade B is mounted in the conventionalmanner upon the guard of the clipper A and is actuated in theconventional manner also. The cutting blade 13, however, is providedwith specially designed cutting teeth [3 which are constructed similarlyto the teeth I0. Each tooth I3 is provided with a straight cutting edgel4 extending at right angles to the longitudinal axis of the row ofteeth and an inclined cutting edge l extends at an angle ofapproximately thirty degrees to the longitudinal axis of 3 Claims. (01.30-225) A In connection with this clipper, however, I prothe row ofteeth. The teeth l3 are adaptedto reciprocate across the guard teeth l0,first toward the right, and then in a return directiontoward the left.By noting particularly Figure 5, it will be observed that as the cuttingblade B is moved toward the right across the guard so as to move theteeth l3 toward the right across the teeth ID, the inclined cuttingedges [5 of the teeth 13 will cut across or against the straight cuttingedges ll of the guard teeth Ill. While the teeth I3 move across and offthe teeth l0, these teeth l3 will betaking hold of the hair or materialbeing cut adjacent the adjoining teeth, thereby making a continuous cutand providing a shearing action without jumping across the adjoiningteeth as is usualwith the conventional type of clipper. Upon the returnaction of the blade B, the straight edge M of the teeth l3 will shearagainst oracross the inclined edges I3 of the teeth [0. Consequently, ashearing action will be produced at both the right and left directionalmovements of the teeth l3 across the teeth Ill, thereby producing aneflicient shearing action, such for instance as is produced by scissorsteeth or blades. I

It has been found by actual experience, that the standard clipper teethof a clip-per blade have a tendency as the blade gets thinner or worn,to

drop slightly between the teeth of the guard which will slightly roundthe edges of the teeth, thereby causing the teeth to become dull. Bymeans of the shearing action produced by the structure shown in detailin Figure 5, the edges of the teeth will tend to remain sharpened andwill remain sharp for a maximum length of time.

It should be understood that the present structure is adapted forclippers such as are now employed for barber use in cutting hair, or thesame structural arrangement may be provided in producing animal shearsfor shearing wool and the like. i

Certain detail changes in the mechanical construction. may be employedwithout departing from the spirit of the invention, so long as suchchanges fall within the scope of the appended claims.

Having described the invention, claim is: r

l. A clipper having a guard, the guard having teeth formed upon theforward edge thereof, each tooth of the guard having one straight andone inclined cutting edge, a cutting blade having'forwardly extendingteeth overlapping the teeth of the guard, each tooth of the cuttingblade having one straight and one inclined cutting edge,

what I the straight edges of the teeth of the guard and the straightedges of the teeth of the cutting blade being substantially parallel andin the same side of the tooth, the inclined cutting edges of the teethof the cutting blade and the inclined edges of the teeth of the guardbeing substantially parallel and on the same side of the tooth, and theteeth of the cutting blade being movable transversely of the teeth ofthe guard to provide a shearing action between the inclined cuttingedges of theteeth of the cutting blade and the straight edges of theteeth of the guard when the cutting blade is moved in one direction anda shearing action between the inclined edges of the teeth of the guardand the straight edges of the teeth of the cutting blade when thecutting blade is moved in the opposite direction.

2. A clipper having a guard, the guard having teeth, each tooth of theguard having one straight edge and one'inclined edge arranged in uniformrelation, a cutting blade having teeth, each tooth of the cutting bladebeing provided with one straight edge and one inclined edge arranged inuniform relation, the teeth of the cutting blade overlapping the teethof the guard, the inclined and straight edges of the teeth of thecutting blade corresponding with the inclined and straight edges of theteeth of the guard in a manner whereby the inclined edges of the teethof the cutting blade will produce a shearing action in conjunction withthe straight edges of the teeth of the guard as the cutting blade ismoved upon the guard in one direction and the straight edges of thecutting teeth will provide a shearing action in conjunction with theinclined edges of the teeth of the guard when the cutting blade is movedin the opposite direction, thereby causing the cutting to always occurbetween the straight and inclined edges of the teeth of the guard andcutting blade.

3. A clipper having a guard, the guard having teeth, each tooth of theguard having one straight edge and one inclined edge arranged in uniformrelation, a cutting blade having teeth, each tooth of the cutting bladebeing provided with one straight edge and one inclined edge arranged inuniform relation, the teeth of the cutting blade overlapping the teethof the guard, the inclined and straight edges of the teeth of thecutting blade corresponding with the inclined and straight edges of theteeth of the guard in a manner whereby the inclined edges of the teethof the cutting blade will produce a shearing action in conjunction withthe straight edges of the teeth of the guard as the cutting blade ismoved upon the guard in one direction and the straight edges of thecutting teeth will provide a shearing action in conjunction with theinclined edges of the teeth of the guard when the cutting blade is movedin the opposite direction, thereby causing the cutting to always occurbetween the straight and inclined edges of the teeth of the guard andcutting blade, the cutting blade being movable for a distance equivalentto the width of a plurality of teeth whereby the teeth of the cuttingblade while moving the distance equivalent to the width of a tooth ofthe guard will begin a shearing action across an adjoining tooth of theguard and vice versa upon the return stroke.

HENRY B. WOMACK.

